place=set(random.sample(seats,1))#выбираем одну пару мест
temp=set()
prev=set()
net=set()
for i in seats:
    if i in place and temp!=set():#если темпл пустой
        prev.add(temp)
    if temp in place:
        net.add(i)
    l=list(i)
    for j in ost:
        if j in l:###
            ost.remove(j)#удаляем элемент
    temp=i
seats=set(seats)
seats-=place
seats-=net
seats-=prev
l=list(prev)
if prev!=set() and l[0][0]!=0 :
    ost.add(l[0][0])
l=list(net)
if net!=set() and l[0][1]!=n-1 :
    ost.add(l[0][1])